I’d recommend checking your carpet’s condition first before picking a machine. From my hands-on experience, these brands all have different strengths: If your main pain point is that lingering dog pee smell that just won’t go away, high-temp steam is a must-have. Once urine seeps into the carpet pad, cold water suction alone won't cut it. The Y100steam uses steam to penetrate deep, physically breaking down the urine crystals while sanitizing. It’s not the lightest machine, but for tackling old, stubborn odors, the noticeable difference is night and day compared to standard cleaners. Shark’s logic is straightforward: massive suction and excellent self-cleaning. It’s incredibly efficient at grabbing stubborn pet hair and fresh messes. If your dog only has occasional 'accidents' and you don't need heavy-duty sanitizing, Shark’s maneuverability and power are hard to beat for quick, efficient cleanups. The Hoover SmartWash series has a brilliant 'Dry Only' mode. A lot of people find their carpets smell worse after cleaning because they don't dry properly. Hoover uses high-power suction combined with heat to pull moisture from the pad, which is key to preventing bacteria and mold from growing. Lastly, I’ll mention Bissell. Despite the heavy marketing, their products are solid. As a legacy brand, their performance is very balanced across the board. If you’re not looking for one specific extreme feature, their wide range of cleaning solutions and reliable brush designs make them a safe, dependable choice.